*{
	margin: 0;
	padding: 0;
}
#big{
	overflow: hidden;
}
#drag{
	width: 200px;
	height: 200px;
	opacity: .5;
	position: absolute;
	display: none;
}
#small,#big{
	width: 400px;
	height: 400px;
	float: left;
	position: relative;
}